Salomon Coster

Christiaan Huygens invented the pendulum in December 1656 and Salomon Coster received the patent to create the clocks a year later.

[4] This clock design was heralded as a new beginning in the clockmaking industry, due to its level of timekeeping accuracy which was previously unheard of.

The oldest extant pendulum clock, signed by Coster in 1657, is on display at the Boerhaave Museum in Leiden, the Netherlands.

[5] Around the same time, John Fromanteel, the son of a London clockmaker named Ahasuerus, went to work for Coster.

[6] He was one of many foreign clockmakers to soon make pendulum clocks following the prototype by Huygens and Coster.